Warp stop mechanism for looms



Lili, "Illini i Tili/ Jm. 12 ,1926. 1,569,828 M. L. STONE WARP STOP MEGHANISII FOR LOOKS Filed oet. w, 1925 f 5 5 101mg/ 1 6) e2 o '3Q .A .i KQ" I l, 1J/z 1816' 2.9 l I Y 4 1a J4 .I4

/N VEN m L @f5-ar /4 TT'ORNE Y Patented Jan. 12, 1926.

UNITED STATES PATENT OFFICE.

MELVIN L. STONE, OF LAWRENCE, MASSACHUSETTS, ASSGNOB, T0 DRAPER CORPORA- TION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE. p

WARP s'ror MECHANISM ron Looms.

Application mea october 7, 1925. serial No. 61,098.

To all whom t may concern.'

Be it known that I, MnLvIN L. STONE, a citizen of the United States, and a resident of Lawrence, in the county of Essex and State of Massachusetts, have invented an Improvement in larp Stop Mechanisms p for Looms, of which the following description, in connection with the accompanying drawings, is specilication, like characters on the drawings representing like parts.

This inventionfrelates to warp stop mechanisms for looms and-is more particularly directed to means for maintaining the drop wires from lateral displacement or swinging' into close engagement, such that should a warp thread become too slack or be broken,

' the unsupported drop wire may not promptly move to stopping position, with the result that imperfect cloth is liable to be woven. In changing the warps in a loom, also, it is now frequently the practice to remove the old warp from the loom while the drop wires are stillstrung upon the warp threads and ,to hold the drop wires in close relation on the drop wire guides during their transportation to the tying in or drawing in machine. y

One of the objectsof the present invention, therefore, is to provide a warp stop mechanism of the type wherein the drop wires are normally supported by the warp threads during weaving with drop wire separators for dividing the series of drop wires into groups to overcome the tendency to lateral swaying movement, and yet permit the drop wires to be assembled in close relation during thetransfer of the drop wires and old warp threads to the tying in or drawing in machines.

The novel features of the invention and new combination of parts kwill best be made clear from the following description and the thereof;

y accompanying drawings of one good form.

In the drawings:

Fig. l is a perspective view with parts broken away. showing a warp stop mechanism containingthe present invention;

Fig. 2 is a plan view showing` two rows of drop wires with the drop wire separators and their separating relation thereto;

Fig. 3 is a cross-section of the warp stop mechanism showing the relation of the drop wires and drop wire separators; and

Fig. 4f is a section on the line 4 4 of Fig. 3, showing more particularly one good form of locking means for locking the drop .wire separator rock shaft.

' The warp stop mechanism is of that general typewherein a series of drop wires are normally supported by the warp threads be tween the shedding mechanism and whip roll during weaving, and, as shown, comprises the end frames l adjustably supported in position, as usual, by the bolts 2, only one of which is indicated in the drawingsn Extending between the end frames 1 are the warp supporting` bars 3 on which the warp threads a: rest during the weaving operation and whereby they are enabled to properly support the drop wires in raised position.

In the present instance of the invention, two rows of drop wires fl, 4t are indicated for the purposes of description and each drop wire is provided with an elongated slot 5 through which pass the drop wire guides 6, the end portions of which are supported in bearings on the end frames 1, as indicated in Fig. 3. In order to maintain the drop wire guides `6 in their normal position during weaving, the end portions of the drop wire guides `are held in position by cap plates 7 which may be conveniently secured in place by securing means such as the screws 8. The drop wires are each provided, inthe present instance. with anopening 9 through each of which passes a warp thread o: where` by the warp threads are enabled to normally support the dropwires in raised position duringr weaving. The present invention is not necessarily restricted tothe particular form of drop wires indicated, but the characteristics and novel features ofthe invention may be advantageously employed with various forms of drop wires of which there are a number of well-known types.

Extending downwardly from the end Too plates or brackets 1 are the portions 10 in `which is supported for rocking movement the usual detector or teeler shaft 11 which may be suitably1 actuated trom a going part ol: the loom by means ot an arm 12 and rod 13, such that during normal Weaving operations the detector or ieeler shatt is oscillated or rocked in its bearings, but when a Warp thread breaks or becomes too slack tor Wear ing; purposes, the detector or teeler sha'tt is arrested in its movement, as usual, by means ot the detector bars let., one oit which eonfacts with the 'fallen drop wire and through any suitzble means ot any usual type Welln knoivin the loom is brought to rest.

lvflonnted in parallel relation with the series drop Wires are the drop Wire separator roclf. shatts 15. 16 which may be eonveniently mounted in rocking` bearings 17 carried by the Warp supiliorting bars 3.

VEach ot the drop wire separator rock shatts 15, 1G carries a nun'iber oit drop Wire separators itl adjustably mounted on each ot the roel; shat'ts for movement into desired positions longitudinally thereof, in which position they may be secured by suitable means, such as the screws 19 which pass thriiug'h the hub portions of the drop Wire separators. Each oit the drop Wire separators, as shown, is preferably 4tormed ot a thin plate and constitutes a linger or projection extending 'troni each ot the rock shafts 15, itl for insertion between the drop ivires, While permittinzgr the latter to remain sub stantially in their proper separated relation transversely oit the loom. In other Words, the drop wire separators 1S are of plate torniation, preferably made sufficiently thin not to interfere materially With the proper location ot the drop wires when inserted between them.

In order that the drop Wire separators 18 may be sinniltaneously moved to and from their position between the drop wires, the rock shatts 1:1, 1G are mounted for rocking movement and one, at least, is provided With manual means 'tor turning the rock shaft, and Where one only ot Such manual means is employed` the tivo rock shafts are connected together for rocking movement in unison and in opposite directions. In the present instance ot the invention, the roclr shattis shown as provided with the crank arm 20 carrying' the hand piece 21 whereby the rock shatt 15 may be manually turned in its bearings to move the separators 18 to and from their drop Wire separating positions.

Each ot the rock shafts is provided with a toothed segment 22 which are geared together, as shown, whereby rocking or turning movement of one shaft is imparted to the other shaft in an opposite direction, to thereby carry the drop Wire separators ot both shafts to and from their drop Wire separating positions.

As one good term of means for securing the toothed segments 22 to the respective roch: shaits 15, itl, cach scppnent 22 may be secured to its roclr sha'lt by a. hub portion 2li clamped to the roel: shalt by a set screvv 211, and to ol vinte the necessity' of unduly increasing the lateral dimensions ot the Warp stop mechanism provided with the present invention, the Warp simpel-tim; bars are each ijirovidcd 'with a slot or opening Q5, as indicated in Fig. l, "whereby the segments may be placed inside the adjacent end trame or ln'aclet 1.

AFrom the construction described it will he appart-.nt that upon rocking movement ot the rock shaft 15 in its bearings, the drop "Wire` sepan-.tors ot both shatls may he simultaneouslv moved to and troni their positions separati gr the drop wires and maintaininplr them 'l'rom lateral eivayinir n'iorcments, and when it becomes desirable to change the Warp in the loom. a moyement ot' one ol' the drop n'ire separator roel; shuits will simultaneously more all ot the drop wire separators from l'ietnccn the drop Wires, thereby perinittineA all the drop Wires to he assembled in close` Contact infr relation on the drop wire guid in which position they may be held by tying; the drop wires together for removal ol the drop Wires and old warp to the tying' in or dran'ine' in machines.

ililhcn the drop wire separatorsA have been moved either to or 'trom their drop wire separating positions, it is desirable that they he locked in such position, and to this end the hand piece Q1 is provided vrith a loci:- ing pin Q6 having' a rounded or conical end portion F27 and normally pressed outwardly by :i light spring' contained in `a reces., .d hub or extension ot the crank Q0, as more 'fully shoivn in Fig. f-l'. The end frame 1 ad jacent. the crank arm 20 is provided with an extension havimof suitable recesses for the icception ot the rounded or conical end portion Q7 ot the locking pin E2G, the construction being such that `:vlien the drop Wire separator roch shafts have been moved into position with the drop Wire separators between the drop wires, the locking pin 2G will act upon the entire series of drop Wire separators to maintain them in their drop Wire separating positions, and conversely. when the drop Wire rock shafts are turned to iemove the drop wire separators from their separating positions to permit a change ot the Warp threads, as above described, the locking pin Q6 by engagen'ient with another recess in the projection 29 will maintain the drop Wire separators in their inoperative position, thereby permitting the drop Wires to be assembled in close relation and tied to- ;ether tor a change in the Warp threads. lllhen such change is to be effected, the ca plates T are released and turned back an the drop wires and drop Wire guide. may

be taken from the warp stop mechanism as a whole and transferred to the tying in or drawing in machine.

TW hat is claimed is:

l. In a warp stop mechanism for looms, the combination of a series of drop wires normally supported in raised position by the wairp threads during weaving, warp supporting bars extending in parallel relation to the series of drop wires, a drop wire separator rock shaft mounted for rocking movement, a series of drop wire separators carried by the rock shaft, means for turning the rock shaft to move the drop wire separators between the drop wires, and a loclr for holding the rock shaft in tirned position.

2. In a warp stop mechanism, the co1nbination of a series of drop wires normally supported by the warp threads during weaving, a drop wire separator rock shaft. a series of drop wire separators carried by the rock shaft for insertion between the drop wires, and a lock for holdingthe rock shaft in position with the separators between the drop wires.`

3. In a Warp stop mechsitnisnrT the combination of a series of drop wires normally supported by the warp threads dui-ir. eaving, a drop Wire separator rock shaft, a series of drop wire separators formed as thin plates carried by the rock shaft for insertion between the drop wires and a lock for holding the rock shaft in position with the separators between the drop wires.

4. In a warp stop mechanism` the combination of a series of drop wires normally supported by the warp threads during weaving,` a drop wire separatorrock shaft, a series of drop wire separators mounted on the rock shaft for adjustment to different positions lengthwise thereof for insertion between the drop wires, and means for ttrnlng the rock shaft to simultaneously insert the separators between the drop wires and remove them therefrom.

5.` In a warp stop mechanism, the combination of two series of drop wires nor mally supported by the warp threads during weaving, a drop wire separator rock shaft mounted adjacent each series of drop wires and provided with drop Wire separators, operative connections between the two drop wire separator rock shafts that they may be rocked in unison, and means for rocking one of said shafts to insert and with draw the separators of both shafts.

6. In a warp stop mechanism, the com bination of two series of drop aires normally supported by the warp threads during weaving, a drop wire separator rock shaft mounted adjacent each series of drop wires and provided with drop wire separators, operative connections between the two drop wire separator roclrshafts that they may be rocked in unison, means for rocking one of said shafts to insert and withdraw the separators of both shafts, and a lock for holding `the rock shafts with the separators inserted `between the drop wires.

7. In a warp stop mechanism, the combination of two series of drop wires normally `supported by the vrarp threads during weaving, a drop wire separator rock shaft mounted adjacent each series of drop wires and provided with drop wire separators, gearing connecting, the two rock shafts to cause them to simultaneously insert and withdraw the separators, and a lock for holding the rock shafts in turned position.

In testimony whereof, I have signed my name to this specification.

MELVIN L. STONE, 

